The hydraulic pump pushes the hydraulic oil, through the filter, in the direction of the pressure relief valve, the pressure accumulator and the hydraulic pressure transmitter. Once the hydraulic oil pressure reaches approximately 70 bar in the valve Pressure regulator and in the hydraulic pressure transmitter, the control unit deactivates the electric motor and thus the hydraulic pump. The bypass allows to guarantee the operation of the system in the event that the filter conduit is obturated.